'Strong' style of Vilnius classicism was a great phenomenon in the East European architecture and existed side by side with the baroque classicism or empire style or 'rational' style. The paper determines the range of buildings, names of creators, characteristic features, peculiarities and significance of Vilnius classicism. It provides a deeper knowledge of the works of the famous Lithuanian architect V. Stuoka-Gucevicus. It is proved that in 1780 the project of the catholic Bishop's Palace and reconstruction of the Carmelite's Church in Mogiliev have been carried out by this architect. Spreading of Vilnius classicism 'strong' style in the Belarussian and Lithuanian architecture was determined. The patriotic domestic nobility chose this style consciously because of their demonstration of the 'knight' behavior in everyday life. Thanks to this style a temple appearance of a house was created by a simple space organization and grand classic portico on the main facade.